Today's name: Cardinal
You know, the red bird most visible in winter against the white backdrop of snow. And although I see no reason why this name should be limited to males, know that the male bird is the brightly colored red, and females are a brown. However, you could also be talking about cardinal north or the senior ecclesiastical official in Catholicism or cardinal numbers, among a few other possibilities.
Potential nicknames: Card, Cardy
Origin: The word cardinal comes from the Latin cardinalis, meaning "chief, principal, pivotal." The bird was named for its resemblance to the cardinal's robes.
Popularity: Although there were 21 baby boys named Cardin (a variant of Carden, meaning "wood carder") in 2010, and 17 in 2011, there were none or less than five named Cardinal both years. I'm surprised there aren't any babies named for the St. Louis Cardinals.